package com.ly.framework.interceptor;

import java.lang.reflect.Method;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.ly.common.annotation.RepeatSubmit;
import com.ly.common.core.domain.AjaxResult;
import com.ly.common.utils.ServletUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
import com.alibaba.fastjson.JSONObject;

/**
 * 防止重复提交拦截器
 * @author ruoyi
 */
@Component
public abstract class RepeatSubmitInterceptor extends HandlerInterceptorAdapter {
    @Override
    public boolean preHandle (HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        if ( handler instanceof HandlerMethod ) {
            HandlerMethod handlerMethod = (HandlerMethod) handler;
            Method method = handlerMethod.getMethod ();
            RepeatSubmit annotation = method.getAnnotation ( RepeatSubmit.class );
            if ( annotation != null ) {
                if ( this.isRepeatSubmit ( request ) ) {
                    AjaxResult ajaxResult = AjaxResult.error ( "不允许重复提交，请稍后再试" );
                    ServletUtils.renderString ( response, JSONObject.toJSONString ( ajaxResult ) );
                    return false;
                }
            }
            return true;
        } else {
            return super.preHandle ( request, response, handler );
        }
    }

    /**
     * 验证是否重复提交由子类实现具体的防重复提交的规则
     * @param request
     * @return
     * @throws Exception
     */
    public abstract boolean isRepeatSubmit (HttpServletRequest request);
}
